From the A109E RFM:
AMBIENT AIR TEMPERATURE LIMITATIONS
The minimum ambient air temperature for operation is -25°C (-13°F).
The maximum sea level ambient air temperature for operation is +45°C (113°F)
and decreases with pressure altitude at the standard lapse rate of 2°C (3.6°F) every
1000 ft (305 m) up to 20000 ft (6096 m)